Regarding who would be better for Palestine—Biden or Trump—it's not very clear. Trump, to his credit, is not a warmonger. He often boasts about being the only recent U.S. President who did not start a new war, arguing that war is bad for business. He is less interested in geopolitics and more focused on geoeconomics. Representing the dovish side of the GOP, he is somewhat unconventional in U.S. foreign policy. However, he could still be compelled to adopt a more hawkish stance, especially if pressured by unforeseen events or the influence of Washington insiders.
As for Biden, he's a hawk whose past policies have put his reelection in jeopardy. One could argue that his past policy failures, could make him more cautious, possibly steering him towards a more dovish approach. Yet, one could argue just as easily that he might intensify involvement in Ukraine, the Middle East, and East Asia, potentially hastening the decline of U.S. influence. Predicting the future is challenging, and I'm not comfortable claiming that either Biden or Trump would contribute more to world peace than the other.